The prognostication of the Professor in regard to the metamorphosis of the digestive apparatus is neither wild nor extravagant. The unborn infant lives on food digested by its mother and introduced into its system. After its birth the food is digested and supplied by its own internal laboratory, instead of that of the mother. It might just as well be supplied by a chemical laboratory. The only essential condition is that the food be perfectly assimilable by the tissues and without any surplus of substances not required. The transfer of the food supply from the circulation of the mother to its production by the chemist is reached by several stages or changes. First it is from the mothers circulation supported by exterior supplies of food. Next it is furnished by the circulation of the infant supported by exterior supplies; commonly beginning with the natural lacteal secretion, then after a time the demand changes from this to stronger food; also to acquired habits in taste the use of stimulants, narcotics etc. Thus nature changes the organism in the most radical way to keep it in conformity with conditions that are necessary for its support, and likewise changes its environment to furnish the conditions with which conformity is essential. If we consider how great the changes are, in the structure and functions of one body during the living of one life; we cannot feel surprised at the changes in human anatomy that we know to have occurred in the long ages up which we have so laboriously toiled, nor at the further changes which the foresight of the Professor points out to us, and for which he helps himself to such a prodigal allowance of time. The changes we have met and passed are far greater than those assumed for the future. As to our evolution we are certainly not yet half through. See page 225, Notes on Mars. The following notes of the conditions of Mars and its tiny satellites are furnished by our mundane astronomers, and will give an idea of the problems that demanded solution by the Lunarians in their famous contract. Gravity on Mars is four-tenths as much as on the Earth. The atmospheric pressure is two and a quarter pounds per square inch against 15 pounds on the Earth. The climate of the poles is much milder than the same regions of Earth, although there are heavy falls of snow. In June and July 1892, 1,600,000 square miles of snow melted off in the southern zone of Mars. April 9, 1890, 3,000,000 square miles of snow fell. Ice is not formed anywhere except close to the poles in winter time. The channels are connected from sea to sea. They are 60 miles wide and from 3,000 to 4,000 miles long in a straight line. There are many of the channels that are duplicates, the duplicate being parallel with and 200 to 400 miles from the main channel. There are from 7 to 20 of these duplicate channels. Most of the surface of Mars is boggy syrtis, neither sea nor good dry land. Clouds float 20 miles high—4 times as high as on Earth.